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VANDENBERG AIR FORCE BASE, Calif. -- A Delta II rocket managed by NASA's Launch Services Program lifted off from Vandenberg Air Force Base, Calif., Tuesday with a spacecraft for the United States Missile Defense Agency. The spacecraft is called the Space Tracking and Surveillance System Advanced Technology Risk Reduction mission, or STSS-ATRR. Liftoff from NASA's Space Launch Complex 2 occurred at 1:24 p.m. PDT.

The launch vehicle was a United Launch Alliance Delta II 7920-10c. Spacecraft separation occurred approximately one hour after liftoff.

"With confirmation of the payload's delivery into the correct orbit, the launch is a success," said Chuck Dovale, launch director for the NASA's Launch Services Program.

NASA also will manage the launch of another mission for the Missile Defense Agency aboard a Delta II rocket this summer from Cape Canaveral Air Force Station.